This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A026467 #4 Mar 30 2012 18:56:08 %S A026467 2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,21,22,23,24,26,27,28,30, %T A026467 31,32,33,35,36,37,38,39,42,43,44,46,47,48,49,50,51,54,55,56,57,59,60, %U A026467 62,63,64,66,67,69,70,71,72,75,76,77 %N A026467 a(n) = least positive integer > a(n-1) and not a(i)^2 + a(j)^2 for 1<=i<j<=n. %K A026467 nonn %O A026467 1,1 %A A026467 _Clark Kimberling_